Unable to login gnome

[leon]

Dear all,

Lately, I won't be able to login gnome. It freezes before showing the
splash screen. Any ideas?

Here is the error messages in ~/.xsession-errors:

/etc/gdm/PreSession/Default: Registering your session with wtmp and utmp
/etc/gdm/PreSession/Default: running: /usr/bin/X11/sessreg -a -w /var/log/wtmp -u /var/run/utmp -x "/var/lib/gdm/:0.Xservers" -h "" -l ":0" "leon"
/etc/gdm/Xsession: Beginning session setup...
_IceTransTransNoListen: unable to find transport: tcp
_IceTransmkdir: ERROR: euid != 0,directory /dev/X will not be created.
_IceTransmkdir: ERROR: Cannot create /dev/X
_IceTransPTSOpenServer: mkdir(/dev/X) failed, errno = 13
_IceTransOpen: transport open failed for pts/leon:
_IceTransMakeAllCOTSServerListeners: failed to open listener for pts
_IceTransISCOpenServer: Protocol is not supported by a ISC connection
_IceTransOpen: transport open failed for isc/leon:
_IceTransMakeAllCOTSServerListeners: failed to open listener for isc
_IceTransSCOOpenServer: Protocol is not supported by a SCO connection
_IceTransOpen: transport open failed for sco/leon:
_IceTransMakeAllCOTSServerListeners: failed to open listener for sco
SESSION_MANAGER=unix/leon:/tmp/.ICE-unix/11258
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